LTC3860

PRODUCTION

Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing

Data Sheet Product Selection Table
Part Models
4
1ku List Price
Starting From $3.12
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Part Details

  • Operates with Power Blocks, DRMOS or External Gate Drivers and MOSFETs
  • Constant Frequency Voltage Mode Control with Accurate Current Sharing
  • ±0.75% 0.6V Voltage Reference
  • Differential Remote Output Voltage Sense Amplifier
  • Multiphase Capability—Up to 12-Phase Operation
  • Programmable Current Limit
  • Safely Powers a Prebiased Load
  • Programmable or PLL-Synchronizable Switching Frequency Up to 1.25MHz
  • Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor
  • VCC Range: 3V to 5.5V
  • VIN Range: 3V to 24V
  • Power Good Output Voltage Monitor
  • Output Voltage Tracking Capability
  • Programmable Soft-Start
  • Available in a 32- Pin 5mm × 5mm QFN Package
LTC3860
Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3860

LTpowerCAD 1

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
DC1184A

LTC3860EUH Demo Board |10V to 14VIN, 1.2V/25A and 1.8V/25A VOUT

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Product Details

Demonstration circuit DC1184A is a dual output voltage mode synchronous buck converter featuring the LTC3860EUH. This board provides two outputs of 1.2V/25A and 1.8V/25A from an input voltage of 10V to 14V at a switching frequency of 500kHz. The power stage consists of the Renesas R2J20602NP which is a tri-state PWM compatible 8mm × 8mm DrMOS and a 0.47µH 13.2mm × 12.8mm iron powder type inductor from Wurth. An on-board 5V LT1616 buck regulator provides the 5V bias for the LTC3860 and the DrMOS.

eval board
schematic 2
DC1755A

LTC3860EUH Demo Board I VIN Range: 6V to 14V, 1.2V/50A and 1.5V/50A VOUT

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Product Details

Demonstration circuit DC1755A provides the user with two high current dual phase synchronous buck converters driven by the LTC3860. These buck converters provide outputs of 1.5V/50A and 1.2V/50A over an input voltage range of 6V to 14V and a switching frequency of 500kHz. The board can be easily modified for a 4-phase, single VO, 100A supply. The power stage for each phase consists of the tri-state PWM compatible 6mm × 6mm Fairchild DrMOS module and a 0.47μH 13.2mm × 12.8mm iron powder type inductor from Würth. A high density, two sided drop-in layout is used. The entire converter, excluding the bulk output and input capacitors, fits within a 2.25” × 1.38” area on the board.
DC1184A
LTC3860EUH Demo Board |10V to 14VIN, 1.2V/25A and 1.8V/25A VOUT
DC1184A - Schematic
DC1755A
LTC3860EUH Demo Board I VIN Range: 6V to 14V, 1.2V/50A and 1.5V/50A VOUT
DC1755A - Schematic

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